| 摘要 |
PROBLEM TO BE SOLVED: To provide an unleaded gasoline which is excellent in cleaning property of interior of an engine and reducing CO and THC contents in exhaust gas. SOLUTION: The unleaded gasoline is obtained by compounding 2-40 vol.% gasoline base material and 1-25 vol.% ethyl tertiary butyl ether (ETBE), wherein the gasoline base material is obtained from a catalytically reformed gasoline which has a polycyclic aromatic content index Y represented by a definite formula of≤20 and is obtained by a catalytic reforming treatment of a desulfurized heavy naphtha fraction having definite properties which is obtained by a desulfurization treatment of a heavy straight-run naphtha having definite properties. The unleaded gasoline has a definite research octane number, a definite motor octane number, a definite 50 vol.% distillation temperature, a definite 90 vol.% distillation temperature and definite Reid vapor pressure. COPYRIGHT: (C)2007,JPO&INPIT
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